1 files changed, 127 insertions, 0 deletions
diff --git a/src/lib/hooks/hooks_config.cc b/src/lib/hooks/hooks_config.cc
new file mode 100644
index 0000000..c6bf9a2
--- /dev/null
+++ b/src/lib/hooks/hooks_config.cc
@@ -0,0 +1,127 @@
+// Copyright (C) 2017-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <hooks/hooks_config.h>
+#include <hooks/hooks_manager.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+
+namespace isc {
+namespace hooks {
+
+void
+HooksConfig::verifyLibraries(const Element::Position& position) const {
+    // The code used to follow this logic:
+    //
+    // Check if the list of libraries has changed.  If not, nothing is done
+    // - the command "DhcpN libreload" is required to reload the same
+    // libraries (this prevents needless reloads when anything else in the
+    // configuration is changed).
+    //
+    // We no longer rely on this. Parameters can change. And even if the
+    // parameters stay the same, they could point to files that could
+    // change. We can skip loading routines only if there were and there still
+    // are no libraries specified.
+    vector<string> current_libraries = HooksManager::getLibraryNames();
+    if (current_libraries.empty() && libraries_.empty()) {
+        return;
+    }
+
+    // Library list has changed, validate each of the libraries specified.
+    vector<string> lib_names = isc::hooks::extractNames(libraries_);
+    vector<string> error_libs = HooksManager::validateLibraries(lib_names);
+    if (!error_libs.empty()) {
+
+        // Construct the list of libraries in error for the message.
+        string error_list = error_libs[0];
+        for (size_t i = 1; i < error_libs.size(); ++i) {
+            error_list += (string(", ") + error_libs[i]);
+        }
+        isc_throw(InvalidHooksLibraries,
+                  "hooks libraries failed to validate - "
+                  "library or libraries in error are: "
+                  << error_list << " (" << position << ")");
+    }
+}
+
+void
+HooksConfig::loadLibraries() const {
+    /// Commits the list of libraries to the configuration manager storage if
+    /// the list of libraries has changed.
+    /// @todo: Delete any stored CalloutHandles before reloading the
+    /// libraries
+    if (!HooksManager::loadLibraries(libraries_)) {
+        isc_throw(InvalidHooksLibraries,
+                  "One or more hook libraries failed to load");
+    }
+}
+
+bool
+HooksConfig::equal(const HooksConfig& other) const {
+
+    /// @todo: This comparision assumes that the library order is not relevant,
+    /// so [ lib1, lib2 ] is equal to [ lib2, lib1 ]. However, this is not strictly
+    /// true, because callouts execution is called in other they're loaded. Therefore
+    /// changing the libraries order may change the server behavior.
+    ///
+    /// We don't have any libraries that are interacting (or would change their behavior
+    /// depending on the order in which their callouts are executed), so the code is
+    /// ok for now.
+    for (isc::hooks::HookLibsCollection::const_iterator this_it = libraries_.begin();
+         this_it != libraries_.end(); ++this_it) {
+        bool match = false;
+        for (isc::hooks::HookLibsCollection::const_iterator other_it =
+                 other.libraries_.begin(); other_it != other.libraries_.end(); ++other_it) {
+            if (this_it->first != other_it->first) {
+                continue;
+            }
+            if (isNull(this_it->second) && isNull(other_it->second)) {
+                match = true;
+                break;
+            }
+            if (isNull(this_it->second) || isNull(other_it->second)) {
+                continue;
+            }
+            if (this_it->second->equals(*other_it->second)) {
+                match = true;
+                break;
+            }
+        }
+        // No match found for the particular hooks library so return false.
+        if (!match) {
+            return (false);
+        }
+    }
+    return (true);
+}
+
+ElementPtr
+HooksConfig::toElement() const {
+    // hooks-libraries is a list of maps
+    ElementPtr result = Element::createList();
+    // Iterate through libraries
+    for (HookLibsCollection::const_iterator hl = libraries_.begin();
+         hl != libraries_.end(); ++hl) {
+        // Entries are maps
+        ElementPtr map = Element::createMap();
+        // Set the library name
+        map->set("library", Element::create(hl->first));
+        // Set parameters (not set vs set empty map)
+        if (!isNull(hl->second)) {
+            map->set("parameters", hl->second);
+        }
+        // Push to the list
+        result->add(map);
+    }
+    return (result);
+}
+
+};
+};